Doctor Eggman Nega, also known as Doctor Nega, is a recurring villain from the Sonic the Hedgehog series. He comes from the future and is the direct descendant of Dr. Eggman. Silver the Hedgehog and Blaze the Cat are his main foes.

Eggman Nega returns as a rival in the Wii version of Mario & Sonic at the London 2012 Olympic Games. He appears as an NPC in the London Party mode and must be spoken to by the player in order to be versed. In the first match he is faced in the Fencing event, but subsequent rematches pit him and the players in Dream Fencing events.

Eggman Nega appears in the 3DS version as a rival in the 4x100m Relay event.